Actual NXD's from PTR queries
'/24 exists' Queries
- We requeried the DNS for 5% of the PTR queries for which a /24 parent zone existed.
- And applied this proportionally to all the '/24 exists’ queries (458878)
'/16 exists' Queries
- We scanned the PTR records in the backup files for the /16s on ns.ripe.net.
For the RIPE NCC allocations
- 55% of PTR queries are for existing PTR records, 45% are not